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Fuel Cell Research Center, Korea Institute of Energy Research, 71-2, Jang-dong, Yuseong-gu, Daejeon, 305-343(Received July 16, 2010 : Accepted July 29, 2010)Abstract: In terms of the system efficiency, it is very useful to apply the ejector into the fuelrecirculation system of a fuel cell system since the ejector needs no parasitic power to operate.Since the conventional automotive fuel cell use hydrogen and air as their fuel, the onlyhydrogen is needed to be recirculated for the better fuel efficiency. On the other hand, thesubmarine fuel cell needs both hydrogen and oxygen recirculation systems because the submarinedrives under the sea. In particular, the cathodic recirculation has to meet the tougher target sincethe oxygen based pressurized stack generally used in the submarine applications generates thesignificant amount of the water in the stack during the operation. Namely, the oxygen utilizationhas designed less than 50% in the whole operating range for the better exhausting of the generatedwaters. And thereby in terms of the oxygen utilization, the entrainment ratio of the ejectorshould be more than 1 within the whole operating range. However, the conventional ejector usinga constant nozzle can not afford to satisfy the mentioned critical requirement. To overcome theproblem, the dual-ejector and its control strategy are designed. The performance of the proposeddual-ejector is verified by the experiments based on the real operating conditions of the targetsubmarine system. Furthermore, the proposed design method can be used for the other fuel recir-culation system of a large-scale fuel cell system with the critical requirement of the fuel utilization.Keywords : Fuel cell, Submarine, Cathodic Recirculation, Dual-ejector

Cathodic Recirculation System Using a Dual-ejector to Improve Oxygen Utilization of a Submarine Fuel Cell